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发布时间：2006-06-22 13:25     点击：

    (A) alert readers to the existence of HDR's as an available energy source

    (B) document the challenges that have been surmounted in the effort to recover energy from HDR's

    (C) warn the users of coal and oil that HDR's are not an economically feasible alternative

    (D) encourage the use of new techniques for the recovery of energy from underground hot water and steam

    (E) urge consumers to demand quicker development of HDR resources for the production of energy

    22. The passage would be most likely to appear in a

    (A) petrological research report focused on the history of temperature-depth records in the United States

    (B) congressional report urging the conservation of oil and natural gas reserves in the United States

    (C) technical journal article concerned with the recoverability of newly identified energy sources

    (D) consumer report describing the extent and accessibility of remaining coal resources

    (E) pamphlet designed to introduce homeowners to the advantages of HDR space-heating systems

    23. According to the passage, an average geothermal gradient of 22℃ per kilometer of depth can be used to

    (A) balance the economics of HDR energy retrieval against that of underground hot water or steam recovery systems

    (B) determine the amount of energy that will be used for space heating in the United States

    (C) provide comparisons between hot water and HDR energy sources in the United States

    (D) revise the estimates on the extent of remaining coal resources in the United States

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